The correct answer is A. April 22.
Earth Day is an annual event celebrated on April 22 to demonstrate support for environmental protection. It was first celebrated in 1970, and is now coordinated globally by the Earth Day Network and celebrated in more than 190 countries.
The date of April 22 was chosen because it is the day that Senator Gaylord Nelson, the founder of Earth Day, first proposed the idea for a national day of environmental action in 1969.
The first Earth Day was a major success, with an estimated 20 million people participating in rallies and events across the United States. Since then, Earth Day has grown into a global event, with millions of people participating each year.
Earth Day is a time to celebrate the Earth and to raise awareness about environmental issues. It is also a time to take action to protect the environment, such as by recycling, conserving energy, and reducing pollution.
The other options are incorrect because they are not the official date of Earth Day.